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Engine cylinder head exhaust valve. Porsche 914-4 1.7L - 022109612D
022109612D/1
Vehicle Group
- Porsche 914 (1970-1976)
Information
Engine Cylinder Head Exhaust Valve, 33 mm.
Diagram Ref No 17
When Replacement Should Be Considered:
Replacement may be necessary when:
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
022109612D
The product you are viewing cross references to these numbers
The OE Match Engine Cylinder Head Exhaust Valve is a precision replacement valvetrain component for the Porsche 914-4 1.7L air-cooled engine.
Fits:- Porsche 914-4 1.7L
Diagram Ref No 17
Located in the cylinder head, the exhaust valve controls the release of burnt combustion gases from the cylinder. During the exhaust stroke, it opens to allow gases to pass into the exhaust system before closing securely against the valve seat for the next engine cycle.
Because exhaust valves operate directly in the path of extremely hot combustion gases, they experience significant thermal and mechanical stress. Correct valve condition, alignment and seating are essential for maintaining cylinder compression, efficient combustion and reliable engine performance.
What This Product Does:
- Controls the release of burnt gases from the combustion chamber.
- Opens during the exhaust stroke to allow gases to leave the cylinder.
- Closes against the valve seat to seal the combustion chamber.
- Helps maintain correct cylinder compression.
- Supports efficient engine breathing and combustion.
- Helps maintain smooth and consistent engine performance.
- Transfers heat from the valve into the valve seat and cylinder head when closed.
- Works with the valve guide, valve seat, spring and associated valvetrain components.
- Replaces a burnt, bent, pitted or excessively worn exhaust valve.
- Helps restore correct cylinder-head operation during an engine rebuild.
The valve must move freely within its guide and contact the valve seat evenly around its circumference. Wear or damage that prevents complete seating can allow compression and hot gases to escape.
Symptoms Of Wear Or Failure:
Possible symptoms include:
- Low or uneven cylinder compression.
- Engine misfires.
- Rough or unstable idle.
- Loss of engine power.
- Poor acceleration.
- Difficult starting.
- Increased fuel consumption.
- Irregular exhaust note.
- Ticking or tapping noises from the valvetrain.
- Poor compression-test results.
- Leakage through the exhaust during a cylinder leak-down test.
- Burnt or pitted valve face.
- Erosion around the seating surface.
- Bent or damaged valve stem.
- Excessive valve-stem wear.
- Heavy carbon deposits.
- Failure of the valve to seal correctly against its seat.
A leaking exhaust valve allows combustion pressure to escape into the exhaust port rather than remaining within the cylinder, reducing compression and engine efficiency.
Why Replacement Matters:
Exhaust valves operate under some of the highest temperatures found inside an air-cooled engine.
Every combustion cycle exposes the valve head and seating surface to hot gases while the valve repeatedly opens and closes at high speed. Over time, the valve may suffer from:
- Valve-face erosion.
- Burning or pitting.
- Carbon accumulation.
- Valve-stem wear.
- Mechanical distortion.
- Heat-related material deterioration.
- Wear caused by excessive valve-guide clearance.
- Damage caused by poor valve seating.
Once the valve can no longer seal correctly, cylinder compression can fall and engine performance can deteriorate.
Replacing a worn or damaged exhaust valve helps restore:
- Correct combustion-chamber sealing.
- Cylinder compression.
- Smooth engine operation.
- Consistent power delivery.
- Efficient exhaust flow.
- Correct valvetrain operation.
- Reliable cylinder-head performance.
When Replacement Should Be Considered:
Replacement may be necessary when:
- The valve face is burnt or badly eroded.
- The seating surface is heavily pitted.
- The valve stem is bent.
- Valve-stem wear exceeds specification.
- Compression is significantly reduced in the affected cylinder.
- Leak-down testing confirms leakage through the exhaust valve.
- The valve has suffered overheating.
- Excessive valve-guide clearance has damaged the valve.
- Cylinder-head inspection determines that the valve cannot be safely reused.
- A cylinder-head or complete engine rebuild is being carried out.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
022109612D
022109612D
1647.039
The product you are viewing cross references to these numbers
Price: £17.00
In stock
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Information
Oil stem seal. Price is for each.
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Click 'Zoom in' for large parts diagram.
Diagram ref no 10
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
95510567500
The product you are viewing cross references to these numbers
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Click 'Zoom in' for large parts diagram.
Diagram ref no 10
Related reference numbers
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95510567500
99610511552
95510567500
1111352900
403.730
107 502
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Price: £3.00
In stock
Vehicle Group
- Porsche 911 1965-1968 2.0L / 912 SWB (F)
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Information
Rennline valve lash tool.
Fits:
Porsche 911 - 1965 to 1989
Porsche 964 - 1989 to 1994
Product Description
Valve lash adjustments on the air-cooled 911 engine can be a frustrating and time consuming experience, even for the seasoned Porsche mechanic.
Working in close, cramped quarters can make valve adjustments an unpleasant procedure.
Finally, there is a simpler, faster and more exacting way to adjust valve lash on all air-cooled Porsche 911 engines! From the professional mechanic to the owner/enthusiast, this easy-to-use device is made to last for many years and will prove to be a valuable addition to your 911 toolbox.
• Repeatable 0.1 mm (.004 in) lash clearance settings on every valve
• Saves time and provides more accurate over traditional feeler gauge methods
• Aluminum and steel construction
• Zinc plated finish provides corrosion protection
• Laser engraved markings
• Durable box with foam insert for safe storage
Fits:
Porsche 911 - 1965 to 1989
Porsche 964 - 1989 to 1994
Product Description
Valve lash adjustments on the air-cooled 911 engine can be a frustrating and time consuming experience, even for the seasoned Porsche mechanic.
Working in close, cramped quarters can make valve adjustments an unpleasant procedure.
Finally, there is a simpler, faster and more exacting way to adjust valve lash on all air-cooled Porsche 911 engines! From the professional mechanic to the owner/enthusiast, this easy-to-use device is made to last for many years and will prove to be a valuable addition to your 911 toolbox.
• Repeatable 0.1 mm (.004 in) lash clearance settings on every valve
• Saves time and provides more accurate over traditional feeler gauge methods
• Aluminum and steel construction
• Zinc plated finish provides corrosion protection
• Laser engraved markings
• Durable box with foam insert for safe storage
Price: £113.00
Orderable